class JiSuanQi:


    def jisuan(self, fuhao, a, b):
        if fuhao == "+":
            return a + b
        elif fuhao == "-":
            return a - b
        elif fuhao == "*":
            return a * b
        else:
            if b != 0 :
                return a / b
            else:
                return "0不能是除数"
j1=JiSuanQi()
print(j1.jisuan("-", 10, 5))